Dispersion of Titania Powder in an Electronic Ink for Electrophoretic Display

Abstract

The colloidal stability of titania powder in electronic ink, which contains an organic solvent of octane and a dispersant of phosphate ester, has been investigated. The concentration of phosphate ester required to stabilize the nonaqueous titania suspension agrees with that needed for monolayer adsorption. Theoretical calculations of potential energies show that the colloidal stability of organic titania suspension is caused by the steric repulsion mechanism. The results of optical properties including reflectivity and response time show that the resulting nonpolar titania suspension meets the requirements of an electronic ink for electrophoretic display.

Surface modification of organic pigment particles for microencapsulated electrophoretic displays

“…Kim et al used laser printer toner particles modified with wax materials to fabricate colored microcapsules containing cyanewhite, magentaewhite and yellowewhite pigment pairs [6]. However, the weakness of inorganic [7,8] and polymer particles [9] in chroma and light reflectance was known to influence the color saturation of display. The organic pigments, on the other hand, have merit of excellent optical properties such as good brilliance, color strength and transparence, and therefore can offer great potential in the context of electronic, optical and photoelectric devices.…”

Preparation of black pigment with the Couette–Taylor vortex for electrophoretic displays

“…EPDs have been intensively researched because of their advantages: high contrast, wide viewing angle, less eye fatigue, low power consumption, and excellent flexibility (Bert et al, 2006;Chen et al, 2003;Chung and Jean, 2007;Comiskey et al, 1998;Kim et al, 2005Kim et al, , 2014Lee et al, 2013;Oh et al, 2009;Park et al, 2013;Sim et al, 2012;Sun et al, 2013;Yin et al, 2011;Zhao et al, 2011). EPDs basically consist of two parallel electrodes, a dielectric fluid, and two charged pigments which are white and black.…”